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Fully integrated broadband tuner

  • US 20040164812A1
  • Filed: 02/25/2004
  • Published: 08/26/2004
  • Est. Priority Date: 02/04/2000
  • Status: Active Grant
First Claim
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1. A phase-locked loop frequency synthesizer comprising:

  • a phase/frequency detector that compares a reference frequency with an output frequency signal and generates an appropriate charge pump control voltage;

    a charge pump coupled to said phase/frequency detector that generates a loop filter control current from the charge pump control voltage;

    a loop filter coupled to said charge pump that generates a loop filter voltage;

    an oscillator bank coupled to the loop filter comprising a plurality of voltage controlled oscillators;

    a feedback circuit coupled between said oscillator bank and said phase/frequency detector that provides the output frequency signal to the phase/frequency detector; and

    a logic interface coupled to said oscillator bank for enabling one of said voltage controlled oscillators at a time.

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